18647942 has 8 divisors (see below), whose sum is σ = 28309176. Its totient is φ = 9211552.

The previous prime is 18647921. The next prime is 18647947. The reversal of 18647942 is 24974681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18647942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18647947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56003 + ... + 56334.

It is an arithmetic number, because the mean of its divisors is an integer number (3538647).

Almost surely, 2^18647942 is an apocalyptic number.

18647942 is a deficient number, since it is larger than the sum of its proper divisors (9661234).

18647942 is a wasteful number, since it uses less digits than its factorization.

18647942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112422.

The product of its digits is 96768, while the sum is 41.

The square root of 18647942 is about 4318.3262961476. The cubic root of 18647942 is about 265.1817526140.

The spelling of 18647942 in words is "eighteen million, six hundred forty-seven thousand, nine hundred forty-two".